Switching device



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25. hollow cylindrical contact Patented Dec. 6, 1927.

UNITED -STATES PATENT OFFICE.

BERNHARD SETTEGAST, E KIEL, GERMANY, ASSIGETGR TO SIGNAL GESELLSCHAFTHIT BESCHRNKTER HAFTUNG, OF KIEL, GERMANY, A. IIBI.

SWITCHING DEVICE.

Application led December 22, 1924, Serial No. 757,468, and in GermanyAugust 26, 1924.

mpiece is fastened.A The ends of the spring are secured to a fork shapedcarrier of the contact iece.

The o ject of the invention is shown as an example in the drawing inwhich Fig. 1 shows a side elevation of the contact device,

Fig. 2 an elevation at right angles to Fig. 1 and l Fig. 3 a top planview with -asectional Y View of the contact piece itself,

The movablepart 1 of the switching device is mounted on a bracket 2 bmeans of a shaft or journal 3 and may be eld in one of its extremepositions by a s ring 4. The

l piece 5 is arran d at the top end of the part l/by means of t ehelical spring 6in" the central axis .of the contact piece. As shown inFig. 3 .only a central portion of the inner face of the contact iece isin contact with the helical spin t e outer ends of 5 being able to moveeely in all directions around this central portion. In this way theouter face of 5 can touch the corresponding cylindrical 35 contacts 7and 8 over a Ime along the whole len h of the contact pieces. l

e corres Ionding fixed contact pieces 7 and 8 may e of prismatic formhaving plane faces 7 and 8', since such faces in- 40 sure good contactbetween the contact members. In the event that one of the contactfaceeof the fprisms becomes injured or covered with a lm of oxide, theprism may be turned about the shaft 9, thus presenting a new face to themovablec'ontact.

The contact arm 1 may be actuated by hand, by an electromagnet, or inany other manner known in the art. Accordingto the invention, one or allof the' contacts ma be arranged upon resilient supports, if desired,

although such mounting is shown in the specification only with respectto the mov- -sup ortin said resilient means and able contact.Furthermore, the invention is not limited to the use of helical springsfor the support of the contact pieces, but any other kind of resi-lientor yielding support may be employed.

I claim:

1. In a switching device, a` contact roller having a short concentricbearing, a helical spring acting as a shaft in the bearing, short studsfitting in the ends of said spring, and a forked arm having two prongsnear the ends of which said studs are mounted.

2. In a switching ldevice a forked lever arm, a resilient shaftingbetween the forks of said arm, a contact having a short bearing at itscenter, said resilient shafting passing freely through the bearing andsupporting said contact.

3. A switching device comprising a stationary contact, a movable contactmember, a short axial bearing through said movable contact member,-resilient axial means supporting said contact member only in said shortbearing and means, adapted to be moved, for sup orting lsaid resilientmeans and moving sait movable contact member.

4. A switching device comprising a stationary contact, a movable contacthaving an axis substantially parallel to said first Contact, an axialbearing through said movable contact comparably short in length with.respect to the length of saidwcontact surface,

axis substantially parallel to the axis ofy f lsaid first contact, anaxial bearing through said movable contact comparabl short 1n lengthwith'respect to the lengths of said contact surfaces, resilient meanssupporting said contact member only insaidfshort axial bearing and meansadapted to be moved for moving mova le contact member.A t f p Intestimony whereof I aix my signature.-

BERNHARD SETTEGAST.

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